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Invision - Prototyping and collaboration for design teams
Anima App - Design, get feedback, convert to code, publish, iterate.
Savahapp - The all-in-one design sharing, collaboration, workflow and app prototyping platform
Sketch Repo - Collection of resources for anyone who uses Sketch
Pastel - Sticky note-based feedback collection tool for live websites
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.